digit [0-9] 
letter [A-Za-z] 

%{ 
	int count; 
	int integer;
%}


%%
	{letter}({letter}|{digit})* count++; 
	{digit}+ integer++; 
%%

int yywrap(void) { 
	return 1; 
}

int main(int argc, char *argv[]) { 
	yyin = fopen(argv[1], "r"); 
	count = 0; 
	integer = 0; 
	yylex(); 
	fclose (yyin); 
	printf("number of identifiers = %d\n", count); 
	printf("number of integers = %d\n", integer);
	return 0;
} 
